replicate both screenspace and world space valley in eevee material?
I'm not sure if Eevee has capability to get there, since all edge detection nodes (like Bevel, Pointiness, or what ever) is not working in Eevee.

The closest I was able to get is with Cycles and yet with problematic part.
Node tree contains Pointiness feature that is sensitive for vertex distances, so to get there I had to use Subdivision Modifier in a very high level. So whole this example is quite useless.
So just for an idea or someones exploration ...
Workbench

Cycles